The boy said ________ couldn’t he work out the problem but his teacher didn’t know how to do it.
--- How often do you eat out? --- _______, but usually once a week.
How I was _______when I heard the _______ news!
_______, a learned man makes fewer mistakes in life than a man without knowledge.
They made a scientific approach ______ the subject.
Not only the USA and Russia but also China ________ manned satellites to circle the earth.